PLATE CLXI. 







FIGS. 



1-3. Spondylosium pulchellum Arch. 1, X 400 ; 2, X 



590 j 3, X 400 . . . . 227 



4-5. Sp. pulchellum var. pyramidatum West. 520 228 

 6-7.% papiUoswn W. & G. S. W. 6, x 520 ; 7, X 



400 . . . . . 223 



8-11.% secedens (De Bary) Arch. 8, X 830 ; 9, X 

 520 ; 10, X 830 ; 11, zygospores, X 600 (after 

 Liitkemuller) .... 225 

 12-14.% tetragomtm West. 12 and 13, X 400 ; 14, X 



1000 . . . . .226 



15.% ellipticum W. & G. S. W. X 520 . 222 



16-27. Hyalotheca dissiliens (Sm.) Breb. 16, X 520; 17*, 

 forma minor Delp. X 510 ; 18*, X 510 ; 19*, 

 vertical view of forma circidare, X 510 ; 20, 

 forma bidentida ; 21, forma tridmtula ; 22, 23, 

 24 and 25, formation of aplanospores, X 520 ; 

 26* and 27*, zygospores, X 510 . . 229 



